Revision as of 23:45, 4 December 2008

Executive Summary

For this project, we were assigned with the dissection of a hard drive. For the dissection, we had to disassemble, analyze, and then reassemble all of the components of the hard drive. We were completely successful in accomplishing all of these tasks.

Introduction

A hard drive is a Seagate Medalist hard drive. It has 4303 MB of capacity and spins at 5400 RPM. Our group consists of Daniel Simich, the group leader, Evangeline Rauch, Emmanuel Albert, Nathan Getze, and Lindsey Garay. Daniel modeled the hard drive in Autodesk Inventor, Lindsey did the presentation and compiled the parts list and disassembly procedure, Nathan analyzed how the product worked and all of the engineering models that could have been used, Emmanuel analyzed some design changes that could be achieved and also some manufacturing changes that could be made, and Evangeline.

Before Disassembly

Before disassembly, Daniel took the hard drive home and installed it onto a computer. The hard drive spun up and data read/write was not tested. When the hard drive spun up, it emitted a high pitch squeal, probably due to its age/lack of use. We estimated that the hard drive had about 50 components.

Disassembly Procedure

To simplify this page, we combined disassembly procedure, part table, and design changes into one table. Each part was taken off in the order that it is listed and any design change is listed next to the part. This is a rendering of the hard drive with its platters exposed.

Part #	Part Name	Quantity	Purpose	Material and Reason for Choice of Material	Manufacturing Process	Tools Used for Removal	Ease of Removal (1-5, 1-easiest, 5-hardest)	Changes and/or Improvements	Reasons for the way it looks	CAD Model/Image
1	Screw	4	hold bracket in place	steel: durable, cheap	extrusion and machining	philips-head screwdriver	1
2	bracket/casing	1	cover, ventilation, easy attachment to computer	steel: durable, cheap		n/a	1		the overall shape of the hard drive conveniently fit into a computer
3	Screw	4	hold on first circuit board	steel: durable, cheap	extrusion and machining	torque wrench T8	2-difficult to find the right tool		Most likely this type of screw to prevent most people from taking it apart
4	circuit board	1	translate data from computer onto the hard drive	silicone	machining	n/a	1
5	anti-static material	1	prevent static from effecting the function of the hard drive			n/a	1		this was shaped to cover the entire inside of the hard drive
6	foil	1	hold cap on hard drive	aluminum	sheet metal forming	n/a	1	could be made reusable so that the hard drive could be reassembled without needing new material
7	hard drive cap	1	enclose hard drive	steel: durable, cheap		n/a	1
8	screw	1-in center	hold on mounting bracket	steel: durable, cheap	extrusion and machining	torque wrench	1
9	screw	1-on arm	hold on mounting bracket	steel: durable, cheap	extrusion and machining	torque wrench	1
10	Screw	2-on outside	hold on mounting bracket	steel: durable, cheap	extrusion and machining	torque wrench	1
11	mounting bracket	1				n/a	1			This is a rendering of the mounting plate
12	screw	1	hold on power and data provider	steel: durable, cheap	extrusion and machining	torque wrench	1
13	power and data provider	1	provide data (still attached by strip)			n/a	1
	screw	1	arm base	steel: durable, cheap	extrusion and machining	torque wrench	1
14	bolts	2	hold on arm bracket	steel: durable, cheap	extrusion	1/4 wrench	1
15	arm bracket turn limiter	1	guide the movement of the arm	plastic	injection molding	n/a	1
16	screws	4	hold on palter	steel: durable, cheap	extrusion and machining	torque wrench	1
17	top of platter piece	1	hold on all of the platers and separators	steel: durable, cheap	metal casting	n/a	1
18	plater #1	1	hold the recorded data	aluminum	metal casting	n/a	1 to remove - 2 to reassemble
19	separator bracket	1	hold the platters separate to they can be accessed by the arms	steel: durable, cheap	metal casting	n/a	1	decreasing the space in between the platters could allow for more platters
20	plater #2	1	hold the recorded data	aluminum	metal casting	n/a	1 to remove - 2 to reassemble
21	separator bracket	1	hold the platters separate to they can be accessed by the arms	steel: durable, cheap	metal casting	n/a	1
22	arm bracket and arm	1	hold writing arm in place	steel: durable, cheap	metal casting	n/a	1			This is a rendering of the arm
23	plater #3	1	hold the recorded data	aluminum	metal casting	n/a	1 to remove - 2 to reassemble
24	separator bracket	1	hold the platters separate to they can be accessed by the arms	steel: durable, cheap	metal casting	n/a	1
25	plater #4	1	hold the recorded data	aluminum	metal casting	n/a	1 to remove - 2 to reassemble	an increase in platters could be beneficial if it was compensated by a higher-speed spindle motor
26	motor screws	3	hold the motor in place	steel: durable, cheap	extrusion and machining	torque wrench	1
27	spindle motor	1	turns the platters	steel: durable, cheap			1	increased speed could allow for more platters but may also cause more heat and vibration		This is a rendering of the motor that spins the platters
ARM
28	teeth screw	1		steel: durable, cheap	extrusion and machining	torque wrench	1
29	baring	1					1

After Disassembly

Assembly

Reassembly was the exact opposite of the disassembly process. All the tools used were exactly the same. During reassembly, one of the arms' top reader was accidentally bent up to ~45° angle.

After Assembly

After assembly, the hard drive was not tested for functionality. This was due to the fact that the arm piece was bent up. For fear that the arm might start to break apart during spin up, the hard drive was not tested.

Concluding Remarks

In conclusion, the disassembly and assembly of the hard drive was successful. Even though the product was not tested after assembly, if the arm was not bent up, the team is confident that the hard drive would still work.

References

APA Style You must use this format (It's easier than MLA, so don't worry).

Guide to Writing Wiki Code

The beauty about Wiki is that if you don't know the code, you can steal it from someone's page that does. Feel free to click the "edit" links or tabs to view the code for sections or the pages respectively. Be weary about wrecking havoc on another's page. Each page can be rollbacked to a previous verison and your username is linked to all changes. Although you might think it's cool to go through and insert "MIKE RULES" throughout the page, I'm sure Dr. Lewis would not be pleased.

Here's a few tips on writing with Wiki:

This is a bracket "[" "]"

This is a brace "{" "}"

To create a new page/link within Wiki:

• Double brackets, page name, double brackets
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Your table of contents is created automatically.

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Italics:

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Media tags are indicated by "Media:", images by "Image:" Broken links in red. Case is not important. Use the toolbar to get examples if you're not sure.

Spacing is werid in wiki. Single return does nothing.

Double return (blank line), breaks the line.

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"br" in "<>" will break lines. They can also be used to separate section headers.

Finally, use the "Show Preview" button on the bottom of the page to see how it looks before saving. It will allow you to catch and edit your errors without having to edit the page again. Just don't forget to save it when you're really done.

This is an example table

See help page for more information on the syntax.

This is the table title

This is Column Header 1	This is Column Header 2	This is Column Header 3
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This starts Row 2	"br" in brackets break lines. Wiki sometimes ignores blank lines.	Some html tags can be used, but not many. Notice the align equals center tag at the beginning of the row. It centers the text in the first two columns, but doesn't work for the third column. I don't know why. Adding the tag again to the beginning of the cell in question will center the text.
This starts Row 3	Image tags are in this format: Double brackets "[[" Image name | = Vertical Line The following order is not important, as long as each is separated by a vertical line: Horizontal position (left, center, right) Thumb (to create clickable thumbnail that links to fullsize image), don't include to make a fullsize Size denoted in pixels (if desired) You can add a caption if there is a thumbnail Then close with double brackets "]]" Broken links show up in red. File:This is a broken link 150px Here's where you can view any uploaded files	This is thumbnail This is a resized image, not a thumbnail, but notice you can still click on it to get the full size.
This starts Row 4	Notice the repeating code for every row? It's important. A vertical line and a dash indicate the start of a new row. An exclamation point indicates the first column. You can put the entire row onto a single line, but it's easier to read if you break it up. Again, wiki usually ignores new paragraphs.	Make sure to end the table correctly (vertical line and closed brace). Not doing so might still display the table, but nothing that comes afterwards.